Bokeh Ultegra Hydro £3,000.00

Size

50cm

52cm

54cm

56cm

58cm

60cm

Colour

Element Grey

Flare Orange

Shutter Black

700C OR 650B

THIS BUILD WITH 700C

THIS BUILD WITH 650B

Pre-order for May '18

Bokeh Ultegra Hydro

"The new Mason Bokeh is a highly capable adventure bike with a feature-packed aluminium frame, splendid aesthetics, and handling that ensures it's as at home on the road as it is on the trail... And it seems you lot agree. Hats off to Dom and his team for making a super UK-conditions bike that can do a bit of everything."

David Atkinson | Road.cc | 2018.

Features

This bike is available with the tough and lightweight HUNT 700c GravelDisc wheels shown or the Specially developed Mason x Hunt 650B AdventureSport wheelset.

Also available with HUNT 650B AdventureCarbon wheelset. The ultimate, all-conquering, wide, light, tough 27.5"/650B gravel road/trail wheelset. By Special Order only.

3rd Bottle cage bosses on the underside of the down tube designed to work seamlessly with Fabric bottles and tool kegs.

Details

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Our frame sets deserve the best components, so we put a great deal of thought into the mix of parts used for each bike build. Bars, stem and crankset are sized to match frame size choice, but we can sometimes make sizing adjustments at your request.

We'll set-up the front brake to be operated by the Right Hand lever for all UK destinations. For destinations outside of the UK, we'll set-up your bicycle with Front Brake/Left Hand as standard. It's no problem for us to set-up the brakes in your own chosen configuration, please state in 'Order Notes' how you like 'em.

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Images may not exactly represent final bike build. See ‘Specifications’ for full listing.

Technical info

Geometry

Sizing

Tech

Select size

50cm

52cm

54cm

56cm

58cm

60cm

62cm

View Full

Dimensions (mm unless specified)

A >

SEAT TUBE C/T

500

B >

SEAT TUBE C/C

453

C >

BB DROP

75

D >

REAR CENTRE

435

E >

TT EFFECTIVE

519.9

F >

TT ACTUAL

503.9

G >

STACK

537.9

H >

REACH

363.5

I >

STAND-OVER

764.1

J >

OFFSET

50

K >

TRAIL

75.3

L >

FORK CROWN HEIGHT

398

M >

HEAD ANGLE

70

N >

HEAD TUBE LENGTH

115

O >

SEAT TUBE ANGLE

74

P >

WHEELBASE

1013.7

Q >

HANDLEBAR (OUTSIDE DIMENSION)

42

View Full

Dimensions (mm unless specified)

A >

SEAT TUBE C/T

520

B >

SEAT TUBE C/C

473.0

C >

BB DROP

75

D >

REAR CENTRE

435

E >

TT EFFECTIVE

535.9

F >

TT ACTUAL

520.3

G >

STACK

554

H >

REACH

374.0

I >

STAND-OVER

781.8

J >

OFFSET

50

K >

TRAIL

72

L >

FORK CROWN HEIGHT

398

M >

HEAD ANGLE

70.5

N >

HEAD TUBE LENGTH

130

O >

SEAT TUBE ANGLE

74

P >

WHEELBASE

1021.8

Q >

HANDLEBAR (OUTSIDE DIMENSION)

42

View Full

Dimensions (mm unless specified)

A >

SEAT TUBE C/T

540

B >

SEAT TUBE C/C

493.5

C >

BB DROP

73

D >

REAR CENTRE

435

E >

TT EFFECTIVE

551

F >

TT ACTUAL

534.4

G >

STACK

568.1

H >

REACH

376.2

I >

STAND-OVER

799.4

J >

OFFSET

50

K >

TRAIL

68.7

L >

FORK CROWN HEIGHT

398

M >

HEAD ANGLE

71.0

N >

HEAD TUBE LENGTH

145

O >

SEAT TUBE ANGLE

73

P >

WHEELBASE

1028.4

Q >

HANDLEBAR (OUTSIDE DIMENSION)

44

View Full

Dimensions (mm unless specified)

A >

SEAT TUBE C/T

560

B >

SEAT TUBE C/C

513.7

C >

BB DROP

73

D >

REAR CENTRE

435

E >

TT EFFECTIVE

561.4

F >

TT ACTUAL

546.3

G >

STACK

579.5

H >

REACH

383.4

I >

STAND-OVER

814.8

J >

OFFSET

50

K >

TRAIL

65.4

L >

FORK CROWN HEIGHT

398

M >

HEAD ANGLE

71.5

N >

HEAD TUBE LENGTH

155

O >

SEAT TUBE ANGLE

73

P >

WHEELBASE

1034.4

Q >

HANDLEBAR (OUTSIDE DIMENSION)

44

View Full

Dimensions (mm unless specified)

A >

SEAT TUBE C/T

580

B >

SEAT TUBE C/C

534.1

C >

BB DROP

70

D >

REAR CENTRE

435

E >

TT EFFECTIVE

580.8

F >

TT ACTUAL

567.2

G >

STACK

587.9

H >

REACH

395.2

I >

STAND-OVER

831.0

J >

OFFSET

50

K >

TRAIL

62.1

L >

FORK CROWN HEIGHT

398

M >

HEAD ANGLE

72

N >

HEAD TUBE LENGTH

165

O >

SEAT TUBE ANGLE

72.5

P >

WHEELBASE

1045.4

Q >

HANDLEBAR (OUTSIDE DIMENSION)

46

View Full

Dimensions (mm unless specified)

A >

SEAT TUBE C/T

60

B >

SEAT TUBE C/C

554.2

C >

BB DROP

70

D >

REAR CENTRE

435

E >

TT EFFECTIVE

590.7

F >

TT ACTUAL

577.1

G >

STACK

607.0

H >

REACH

399.1

I >

STAND-OVER

850.0

J >

OFFSET

50

K >

TRAIL

62.1

L >

FORK CROWN HEIGHT

398

M >

HEAD ANGLE

72

N >

HEAD TUBE LENGTH

185

O >

SEAT TUBE ANGLE

72.5

P >

WHEELBASE

1055.4

Q >

HANDLEBAR (OUTSIDE DIMENSION)

46

View Full

Dimensions (mm unless specified)

A >

SEAT TUBE C/T

B >

SEAT TUBE C/C

C >

BB DROP

D >

REAR CENTRE

E >

TT EFFECTIVE

F >

TT ACTUAL

G >

STACK

H >

REACH

I >

STAND-OVER

J >

OFFSET

K >

TRAIL

L >

FORK CROWN HEIGHT

M >

HEAD ANGLE

N >

HEAD TUBE LENGTH

O >

SEAT TUBE ANGLE

P >

WHEELBASE

Q >

HANDLEBAR (OUTSIDE DIMENSION)

AdventureSport Full Geometry

This page gives you some guidelines based on height, but these are only a starting point for a proper bike fitting. The dimensions show the extremes of useable frame size based on height.

Fitting a bike to a rider is an important process, this information is a start to the process but it’s not really possible to give 100% accurate fitting instructions online.

Humans are odd shapes, each person’s physical dimensions: arm, torso, femur length, level of flexibility even skill level are very different. This means that there will invariably be different frame size requirements, even for people of the same height and inseam.

We are experienced in sizing and geometry, so of course we will be on the end of the phone or email to help and advise, but I would always recommend having a proper bike fit done before committing, especially if you feel like you may be between sizes.

We have specified bar width, stem length, and crank length to be the best fit for the majority of riders on each frame size, but we can sometimes make adjustments to this at your request. Please contact us for advice, or just let us know your sizing requirements in the comments box at the checkout page.

We'll set-up the front brake to be operated by the Right Hand lever for all UK destinations. For destinations outside of the UK, we'll set-up your bicycle with Front Brake/Left Hand as standard. It's no problem for us to set-up the brakes in your own chosen configuration, please state in 'Order Notes' how you like 'em.

If you are between sizes, it’s probably best to go with the smaller size. It’s easier to make a smaller frame fit a little larger than vice versa.

Multiport

Unique to MASON. Our frames use an adaptable, internal cable routing system. Developed by us to allow your Mason frame to be used with a combination of control systems and adapt and evolve with your requirements and riding styles. We are the first to bring this type of system to a performance steel frame. Interchangeable alloy parts allow five options:

Taper Head Tubes

The large overall diameter provides a useful weld area. The fully integrated headset is light and has a very low stack-height. Large 1.5” lower bearing, mated to a tapered carbon fork steerer, spreads the load and gives flex-free braking and instant response to steering input.

Threaded Bottom Brackets

We choose a more traditional 68mm, BSA, threaded standard for our AdventureSport frames because we believe it gives greater durability and creak-free reliability over many miles. The threaded BB is easier to service using standard tools and you are more likely to find a replacement when adventuring far from home. A properly lubricated, threaded BB is also an ideal interface with a metal BB shell.

ThruBB

'ThruBB' is unique to MASON. The large 50mmØ presents a large weld area to the base of the down tube and then steps down to the 68mm width threaded seats. This step-down provides plenty of space around the outside of the bottom-bracket bearings to allow the control cable and hose to pass through on the way to the chain stays and out to the brake and rear mech.

IMPORTANT: This BB shell design requires the use of a bottom bracket with a 24mm 'sleeved' axle, because the hose/cables run through the shell and under the axle. DO NOT use a bottom bracket type without a sleeve. Campagnolo sleeves are available on the site HERE. Please contact us if you would like advice on compataible cranksets/BB types.

BoatTail Stays

Unique to MASON. The seat stays flow out of the ovalised top tube and then curve and taper down to meet the chain stays which curve up towards the axle. We call this ‘BoatTail’, a custom bend giving disc-rotor and calliper clearance, helping to avoid chain-slap on the rough stuff and allowing a little compliance to help smooth the ride.

F-Stop Axle System: Bokeh

The Mason F-Stop Axle System was developed for our exclusive Aperture2 fork and we now use the special axle for the Mason Parallax fork on the Bokeh and BokehTi.
The axle uses a positive-closure release lever, ensuring that the wheel is always securely and firmly mounted with the added advantage of a visual check for the lever closure and orientation.

The F-Stop system also includes a ‘clockable’ thread on the axle, meaning you can always position the release lever exactly where you want it.

Dedacciai Tubing

This frame is constructed from Triple Butted, Hand Selected, custom shaped, 7000 series, Dedacciai Alu tubes and tig welded by hand with beautiful Smooth weld beads. The welds require no after sanding or finishing, so there is no thinning and weakening of the tubes at crucial areas. The frame is fully heat treated and stress relieved after welding.

27.2 Seat Post

Our oversize seat tubes don't house oversize seat posts. The large diameter seat tube helps the 'core-stability' of the frame but large, stiff seat posts don't help rider comfort. A 27.2mm post helps to dial out road-buzz and the smoother ride means you stay fresher for longer.

Disc Brakes

This frame is designed for disc brakes. They work consistently in all conditions, pull up quicker in the wet, they don't grind your expensive rims into black sludge and in my experience they change the whole riding experience for the better, especially when coupled with modern disc-specific wheels and high-volume tyres. You’ll find yourself riding in a more confident, controlled, fluid and ultimately more efficient way.

Internal Routing

The cables, hoses and electronic shift control wires run through the frame tubes, guided by our Mason 'MultiPort' adaptable inserts. Interchangeable Internal routing keeps the control cabling away from road dirt and grime, helps avoid accidental damage, makes cleaning easy, de-clutters your bike and means you can adapt your bike easily to work with various shifting and braking methods. For adventure and endurance riding, internal routing also has the advatage that it is easy to strap frame packs to the frame tubes without being hindered by external cabling and hoses.

Integrated Headset

The headset drops into a tapered seat in the head tube and is tensioned using a headset tensioner within the fork steerer. Tensioning the headset centres it on the taper and prevents any play. The larger lower bearing allows a tapered steerer and larger crown. This gives sharper response, helps reduce flex under braking and spreads bearing load.

ISO Testing

All our frames complete the intensive strength and fatigue testing to fully comply with ISO standards. The AdventureSport range of frames are put through the tough road race ISO testing, with its brutal Horizontal Fatigue test. The Parallax fork goes through the MTB test with it's even tougher 'Drop Testing' standards. Because of this we are confident that these frames will last you a lifetime of hard riding.

It's not law that frames and forks have to be tested to their limits like this, but our frames will always be tested in this way, so you can be sure that your MASON frame not only looks beautiful with a ride quality to match, but it is tough, safe and dependable too.

650B/700C

The Bokeh is optimsed for large-volume treaded tyres, and is designed for 650B and 700C wheel sizes. Using the smaller 650B wheel means that you can fit a larger-volume treaded tyre, but with the same rolling radius as a 700C x 28mm wheel/tyre.

Bottle #3

A third bottle cage mount at the base of the down-tube to allow for an additional bottle or tool keg to be fitted. Designed for low-mount Fabric 'cageless' bottles and kegs (but of course suitable for traditional bottles and cages too), the third bosses are positioned close to the BB to maximise tyre clearance and keep the centre of gravity low.

FlatMount Brake Calipers

Flat mount disc-brake callipers are lighter, neater, and open up more space within the dropout area for racks and ‘guards. The calliper is mounted to the dropout, allowing us to use a lighter, more comfortable seat-stay. Up front, the calliper is mounted directly to the fork [via the brake manufacturers adaptor] and offers a cleaner and more minimalist appearance and also provides a compact packaging of the brake caliper.

DForm Downtube

Our Resolution frame uses a special 'D-Section', Columbus Spirit, down tube. We also worked with Dedacciai to design and tool for the exclusive Mason ‘DForm’ Ti down tube for the BokehTi. It is not a simple ‘D’ section and varies in shape from being taller/narrower at the head tube to being wider and lower in section where it meets the BB shell. This shape allows a very wide weld where the tube meets the BB, giving it great stability and ensuring that the weld doesn’t excessively overlap onto the base of the seat tube.

Parallax Thru-Axle Fork

Unique to MASON. This frame is fitted with our ‘Parallax’ 465g, Ø12mm thru-axle/flat-mount, monocoque carbon fork. We develop our own custom tubing and wheels, so when it comes to the forks for our bicycles it makes total sense for us to design and tool up for our own fork too. We don’t want to compromise ride-feel, balance and performance by using an ‘off-the-shelf’ and generic product.Features: Custom layup UD carbon construction, Mason F-Stop axle with clockable axle, allowing you to re-position the release lever as things bed in. TrueTaper steerer, sealed Internal Routing, dynamo light eyelet on crown, discrete eyelets for mudguard mounting. Huge clearance with full mudguard clearance even when using the largest tyres.

Essental Dimensions: Bokeh

BRAKING

Rotor Size: The fork can take a 140 or 160mm rotor [using adaptor]. We recommend no smaller than 160mm up front if you are using cable braking. 160mm is the maximum recommended diameter for the rear and the native rotor size is 140mm.

Calliper Type: These frames are designed for flat-mount calipers. It's possible to fit post-mount calipers front and rear with the use of a flat > post-mount adapter.

NOTE: This frame is compatible with most modern disc-brake systems but may not be suitable for ALL brake callipers. Please check clearance before purchasing your braking system.

Specifications

Our frame sets deserve the best components, so we put a great deal of thought into the mix of parts used for each bike build. Bars, stem and crankset are sized to match frame size choice. See Geometry chart for component sizing.